Trash recyclers sort through piles of plastic and other material. Some 15 million people around the world make a living off sorting through and recycling trash, usually in developing countries where few governments recycle their trash. Jack Chang / MCT

Roberto Rodriguez (center) talks to a fellow recycler in a scavenger camp set up in one of the richest neighborhoods of Buenos Aires, Argentina. Jack Chang / MCT

Piles of trash fill a poor neighborhood in General San Martin, Argentina. Jack Chang / MCT

Cristian Robles surveys the encampment in one of the richest neighborhoods of Buenos Aires, Argentina. They moved there after a train that used to transport them and their scavenged trash back home outside the city stopped operating. Jack Chang / MCT